US11169276B2 - Satellite signal receiving circuit and satellite signal receiving method - Google Patents
Satellite signal receiving circuit and satellite signal receiving method Download PDFInfo
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- US11169276B2 US11169276B2 US16/265,119 US201916265119A US11169276B2 US 11169276 B2 US11169276 B2 US 11169276B2 US 201916265119 A US201916265119 A US 201916265119A US 11169276 B2 US11169276 B2 US 11169276B2
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- signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/33—Multimode operation in different systems which transmit time stamped messages, e.g. GPS/GLONASS
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/32—Multimode operation in a single same satellite system, e.g. GPS L1/L2
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/36—Constructional details or hardware or software details of the signal processing chain relating to the receiver frond end
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
Definitions
- the present invention generally relates to the Global Navigation Satellite System (GNSS), and, more particularly, to satellite signal reception for the GNSS.
- GNSS Global Navigation Satellite System
- FIG. 1 shows the frequency bands used by several satellite systems.
- the frequency band 110 corresponds to the Soviet Union's Global Orbiting Navigation Satellite System (GLONASS) having a center frequency of 1602 MHz
- the frequency band 120 corresponds to the European Union's Galileo having a center frequency of 1575.42 MHz
- the frequency band 130 corresponds to the US Global Positioning System (GPS) having a center frequency of 1575.42 MHz
- the frequency band 140 corresponds to China's BeiDou Navigation Satellite System (BDS) having a center frequency of 1561.098 MHz.
- GLONASS Global Orbiting Navigation Satellite System
- GLONASS Global Orbiting Navigation Satellite System
- the frequency band 120 corresponds to the European Union's Galileo having a center frequency of 1575.42 MHz
- the frequency band 130 corresponds to the US Global Positioning System (GPS) having a center frequency of 1575.42 MHz
- the frequency band 140 corresponds to China's BeiDou Navigation Satellite System (BDS) having
- Patent Publication Nos. US20090124221 and US20100097966, and U.S. Pat. No. 7,551,127 utilizes two sets of receivers and two sets of frequency synthesizers to achieve double band reception (i.e., simultaneously receiving satellite signals of two different center frequencies). However, using two sets of receivers simultaneously doubles the power consumption.
- the U.S. Patent Publication No. US20100097966 implements double band reception by sharing a low noise amplifier and using a frequency synthesizer to output two types of oscillation signals to two down-conversion receiving paths, respectively.
- the U.S. Pat. No. 7,551,127 utilizes a reconfigurable frequency divider to achieve double band reception.
- One of the disadvantages of the above-mentioned double band receivers is that it can only receive satellite signals of two frequency bands, which limits the positioning speed and positioning accuracy of the satellite navigation receiver.
- an object of the present invention is to provide a satellite signal receiving circuit and a satellite signal receiving method capable of simultaneously receiving three frequency bands, so as to make an improvement to the prior art.
- a satellite signal receiving circuit is provided.
- the satellite signal receiving circuit is configured to receive a satellite signal and includes an oscillator, a first mixer, a first phase shifter, a second mixer, a first low-pass filter, a second low-pass filter, a second phase shifter, a first phase operation circuit, a second phase operation circuit, and a bandpass filter.
- the oscillator is configured to generate a first reference signal.
- the first mixer is coupled to the oscillator and configured to mix the first reference signal with the satellite signal to generate a first mixed signal.
- the first phase shifter is coupled to the oscillator and configured to adjust a phase of the first reference signal to generate a second reference signal, the first reference signal and the second reference signal being in quadrature.
- the second mixer is coupled to the first phase shifter and configured to mix the second reference signal with the satellite signal to generate a second mixed signal.
- the first low-pass filter is coupled to the first mixer and configured to filter the first mixed signal to obtain a first filtered signal.
- the second low-pass filter is coupled to the second mixer and configured to filter the second mixed signal to obtain a second filtered signal.
- the second phase shifter is coupled to the second low-pass filter and configured to adjust a phase of the second filtered signal to generate a phase-shifted signal.
- the first phase operation circuit is coupled to the first low-pass filter and the second phase shifter and configured to perform operations on the first filtered signal and the phase-shifted signal to generate a first satellite baseband signal.
- the second phase operation circuit is coupled to the first low-pass filter and the second phase shifter and configured to perform operations on the first filtered signal and the phase-shifted signal to generate a second satellite baseband signal.
- the bandpass filter is coupled to the first mixer and the second mixer and configured to filter the first mixed signal and the second mixed signal to obtain a third satellite baseband signal.
- a satellite signal receiving method includes the steps of: (a) receiving a satellite signal; (b) providing a first reference signal; (c) mixing the first reference signal and the satellite signal to obtain an in-phase component of the satellite signal; (d) providing a second reference signal, the first reference signal and the second reference signal being in quadrature; (e) mixing the second reference signal and the satellite signal to obtain a quadrature component of the satellite signal; (f) low-pass filtering the in-phase component of the satellite signal and the quadrature component of the satellite signal; (g) phase-shifting the low-pass filtered quadrature component of the satellite signal to generate a phase-shifted quadrature component; (h) calculating a sum of the phase-shifted quadrature component and the low-pass filtered in-phase component of the satellite signal to obtain a first satellite baseband signal; (i) calculating a difference between the phase-shifted quadrature component and the low-pass filtered in-phase component of the satellite signal to obtain a second satellite baseband signal; and
- the invention utilizes one voltage-controlled oscillator (VCO) to realize triple band reception of satellite signals.
- VCO voltage-controlled oscillator
- FIG. 1 illustrates the frequency bands used by several satellite systems.
- FIG. 2 illustrates a functional block diagram of a satellite signal receiving circuit according to an embodiment of the present invention.
- FIGS. 3A-3B illustrate flowcharts of a satellite signal receiving method according to an embodiment of the present invention.
- FIG. 4 illustrates a functional block diagram of a satellite signal receiving circuit according to another embodiment of the present invention.
- connection between objects or events in the below-described embodiments can be direct or indirect provided that these embodiments are practicable under such connection.
- Said “indirect” means that an intermediate object or a physical space exists between the objects, or an intermediate event or a time interval exists between the events.
- the disclosure herein includes a satellite signal receiving circuit and a satellite signal receiving method.
- the detail of such elements is omitted provided that such detail has little to do with the features of this disclosure and this omission nowhere dissatisfies the specification and enablement requirements.
- Some or all of the processes of the satellite signal receiving method may be implemented by software and/or firmware and can be performed by the satellite signal receiving circuit or its equivalent.
- a person having ordinary skill in the art can choose components or steps equivalent to those described in this specification to carry out the present invention, which means that the scope of this invention is not limited to the embodiments in the specification.
- FIG. 2 is a functional block diagram of a satellite signal receiving circuit according to an embodiment of the present invention
- FIGS. 3A and 3B are flowcharts of a satellite signal receiving method according to an embodiment of the present invention. The details of the operations of the present invention are described below with reference to FIGS. 2, 3A and 3B .
- the satellite signal receiving circuit 200 receives the satellite signal SA through the antenna 211 (step S 305 ) and then utilizes an amplifier 212 (e.g., a low-noise amplifier (LNA)) to amplify the satellite signal SA to thereby generate a satellite signal SB (Step S 310 ).
- an amplifier 212 e.g., a low-noise amplifier (LNA)
- a RF1 , A RF2 and A RF3 are amplitudes of the frequency band 110 , the frequency band 120 (or 130 ), and the frequency band 140 , respectively.
- G 1 is the gain of the amplifier 212 .
- a first reference signal and a second reference signal are provided, and the first reference signal and the second reference signal are in quadrature (steps S 315 , S 320 ).
- the VCO 213 provides a first reference signal SO of frequency f LO (step S 315 ), and a second reference signal SOQ is generated after the phase of the first reference signal SO is adjusted by 90° by the 90° phase shifter 214 (step S 320 ).
- the first reference signal SO and the second reference signal SOQ can be provided by separate VCOs 213 , respectively.
- the circuit using one VCO is more power saving than the circuit using two VCOs and can avoid the problem of frequency pulling between the two oscillators.
- the frequency f LO may be set between the center frequency of the frequency band 120 (or 130 ) and the center frequency of the frequency band 110 , or between the center frequency of the frequency band 120 (or 130 ) and the center frequency of the frequency band 140 .
- the present invention will be described in detail by an example of setting the frequency f LO of the first reference signal SO to be between the center frequency of the frequency band 120 (or 130 ) and the center frequency of the frequency band 110 (i.e., ⁇ RF2 ⁇ LO ⁇ RF1 ).
- the first reference signal SO and the satellite signal SB are first mixed and then low-pass filtered to thereby generate an in-phase component of the down-converted satellite signal (steps S 325 , S 327 ). More specifically, in the embodiment of FIG. 2 , the satellite signal receiving circuit 200 utilizes the mixer 215 and the low-pass filter (LPF) 217 to implement these two steps.
- the mixer 215 mixes the satellite signal SB with the first reference signal SO to obtain the mixed signal SC, and then the LPF 217 low-pass filters the mixed signal SC to obtain the filtered signal SD.
- the mixed signal SC and the filtered signal SD can be expressed by expressions (5) and (6), respectively:
- the second reference signal SOQ and the satellite signal SB are first mixed and then low-pass filtered to thereby generate a quadrature component of the down-converted satellite signal (steps S 330 , S 332 ). More specifically, in the embodiment of FIG. 2 , the satellite signal receiving circuit 200 utilizes the mixer 216 and the LPF 218 to implement these two steps.
- the mixer 216 mixes the satellite signal SB with the second reference signal SOQ to obtain the mixed signal SG, and then the LPF 218 low-pass filters the mixed signal SG to obtain the filtered signal SH.
- the mixed signal SG and the filtered signal SH can be expressed by expressions (7) and (8), respectively:
- the in-phase component and the quadrature component of the satellite signal are amplified (step S 335 ). More specifically, in the embodiment of FIG. 2 , the filtered signal SD is amplified by the amplifier 219 (e.g., a programmable gain amplifier (PGA) having a gain of G 2 ) and thus becomes an amplified filtered signal SE.
- the filtered signal SH is amplified by the amplifier 220 (e.g., a PGA having a gain of G 2 ) and thus becomes an amplified filtered signal SI.
- the amplified filtered signal SE and the amplified filtered signal SI can be expressed by expressions (9) and (10), respectively:
- the quadrature component of the satellite signal is phase shifted to generate a phase-shifted quadrature component (step S 340 ). More specifically, the intermediate frequency (IF) 90° phase shifter 221 performs phase-shifting on the amplified filtered signal SI (e.g., phase-shifted by substantially 90°) to obtain a phase-shifted signal SJ, which can be expressed by expression (11):
- the sum of the phase-shifted quadrature component and the in-phase component of the satellite signal is calculated to obtain a first satellite baseband signal (step S 345 ). More specifically, because f LO is set to be between the center frequency of the frequency band 120 (or 130 ) and the center frequency of the frequency band 110 , the satellite signal of the Galileo system (or the GPS) is a mirror signal of the satellite signal of the GLONASS.
- the phase operation circuit 222 e.g., a phase combiner adds the amplified filtered signal SE and the phase-shifted signal SJ to obtain a satellite baseband signal SF, which can be expressed by expression (12):
- the difference between the phase-shifted quadrature component and the in-phase component of the satellite signal is calculated to obtain a second satellite baseband signal (step S 350 ). More specifically, because f LO is set to be between the center frequency of the frequency band 120 (or 130 ) and the center frequency of the frequency band 110 , the satellite signal of the GLONASS is also a mirror signal of the satellite signal of the Galileo system (or the GPS).
- the phase operation circuit 223 e.g., a phase combiner
- the quadrature component and the in-phase component of the satellite signal are bandpass filtered to obtain another satellite baseband signal (step S 355 ). More specifically, in this step, the bandpass filter (BPF) 226 performs bandpass filtering on the quadrature component (i.e., the mixed signal SG) and the in-phase component (i.e., the mixed signal SC) of the satellite signal to obtain the satellite baseband signal SL (i.e., bandpass-filtered signal).
- the bandpass filter (BPF) 226 performs bandpass filtering on the quadrature component (i.e., the mixed signal SG) and the in-phase component (i.e., the mixed signal SC) of the satellite signal to obtain the satellite baseband signal SL (i.e., bandpass-filtered signal).
- the bandpass filtering filters out the high frequency components (cos( ⁇ LO + ⁇ RF1 )t, cos( ⁇ LO + ⁇ RF2 )t and cos( ⁇ LO + ⁇ RF3 )t) and the low frequency components (cos( ⁇ LO ⁇ RF1 )t and cos( ⁇ LO ⁇ RF2 )t).
- the in-phase component (SL_I) and the quadrature component (SL_Q) of the satellite baseband signal SL can be expressed by expressions (14) and (15), respectively:
- SL_I G 1 ⁇ [ A RF ⁇ ⁇ 3 2 ⁇ cos ⁇ ⁇ ( ⁇ LO - ⁇ RF ⁇ ⁇ 3 ) ⁇ t + j ⁇ A RF ⁇ ⁇ 3 2 ⁇ sin ⁇ ( ⁇ LO - ⁇ RF ⁇ ⁇ 3 ) ⁇ t ] ( 14 )
- SL_Q G 1 ⁇ [ A RF ⁇ ⁇ 3 2 ⁇ cos ⁇ ⁇ ( ⁇ LO - RF ⁇ ⁇ 3 ) ⁇ t - j ⁇ A RF ⁇ ⁇ 3 2 ⁇ sin ⁇ ( ⁇ LO - ⁇ RF ⁇ ) ⁇ t ] ( 15 )
- the satellite baseband signal SL can be expressed by expression (16):
- ⁇ t ⁇ G 1 ⁇ A RF ⁇ ⁇ 3 ⁇ ⁇ cos ⁇ ⁇ ⁇ IF ⁇ ⁇ 3 ⁇ t ( 16 )
- the bandpass filter 226 can be implemented, for example, by an image rejection bandpass filter.
- the analog-to-digital converters (ADC) 224 , 225 and 228 respectively convert the satellite baseband signal SF, the satellite baseband signal SK, and the amplified satellite baseband signal SM into the digital domain (step S 365 ).
- the digital signal processor (DSP) 229 amplifies these three satellite baseband signals again with a coding gain (step S 370 ) and then generates location information according to these three satellite baseband signals.
- the satellite baseband signal SF corresponds to the satellite signal of the GLONASS
- the satellite baseband signal SK corresponds to the satellite signal of the Galileo system or the GPS
- the satellite baseband signal SL and the amplified satellite baseband signal SM correspond to the satellite signals of the BDS.
- the frequency f LO is set to be
- f LO may be set to be equal to half the sum of the substantially lowest frequency of the frequency band 120 (or 130 ) and the substantially highest frequency of the frequency band 110 .
- f LO ⁇ (1573.374+1605.375)/2.
- the satellite signal of the Galileo system (or the GPS) and the satellite signal of the BDS are each other's mirror signals; in this case, the satellite baseband signal SF corresponds to the satellite signal of the Galileo system or the GPS, the satellite baseband signal SK corresponds to the satellite signal of the BDS, and the satellite baseband signal SL and the amplified satellite baseband signal SM correspond to the satellite signals of the GLONASS.
- the frequency f LO is set to be
- f LO may be set to be equal to half the sum of the substantially highest frequency of the frequency band 120 (or 130 ) and the substantially lowest frequency of the frequency band 140 .
- f LO ⁇ (1577.466+1559.052)/2.
- step S 330 can be performed before step S 327 ; step S 355 can be performed before steps S 345 and S 350 .
- steps S 340 , S 345 , and S 350 of FIG. 3B may also be performed in the digital domain, that is, steps S 340 , S 345 , and S 350 may also be performed after step S 365 , and the corresponding circuit diagram is shown in FIG. 4 .
- the satellite signal receiving circuit 400 utilizes the IF 90° phase shifter 421 , the phase operation circuit 422 , and the phase operation circuit 423 to perform steps S 340 , S 345 , and S 350 in the digital domain
- the functions of the IF 90° phase shifter 421 , the phase operation circuit 422 , and the phase operation circuit 423 can also be implemented by the DSP 429 , that is, the steps S 340 , S 345 , and S 350 are performed by the corresponding modules in the DSP 429 .
- These modules can be implemented by hardware (e.g., circuits) or by a control circuit of the DSP 429 (e.g., a microcontroller, a microprocessor, etc.) executing program codes or program instructions.
- the present invention implements triple band reception of satellite signals, that is, the satellite signal receiving circuit and the satellite signal receiving method of the present invention can simultaneously receive satellite signals of three different center frequencies.
- the forgoing embodiments are exemplified by the GNSS, the present invention can also be applied to other systems.
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Abstract
Description
SA=A RF1 cos ωRF1 t+A RF2 cos ωRF2 t+A RF3 cos ωRF3 t (1)
SB=G 1(A RF1 cos ωRF1 t+A RF2 cos ωRF2 t+A RF3 cos ωRF3 t) (2)
SO=cos ωLOt (3)
SOQ=sin ωLOt (4)
SM=G 1 ·G 2 ·A RF3 cos ωIF3 t (17)
fLO may be set to be equal to half the sum of the substantially lowest frequency of the frequency band 120 (or 130) and the substantially highest frequency of the
fLO may be set to be equal to half the sum of the substantially highest frequency of the frequency band 120 (or 130) and the substantially lowest frequency of the
Claims (14)
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TW107105198 | 2018-02-13 | ||
TW107105198A TWI642961B (en) | 2018-02-13 | 2018-02-13 | Satellite signal receiving circuit and satellite signal receiving method |
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US20190250281A1 US20190250281A1 (en) | 2019-08-15 |
US11169276B2 true US11169276B2 (en) | 2021-11-09 |
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CN1642028A (en) * | 2004-01-06 | 2005-07-20 | 台达电子工业股份有限公司 | Front end module for multi-frequency multi-mode wireless network system |
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OA letter of the counterpart CN application (appl. No. 201810162465.5 ) mailed on Sep. 24, 2020. Summary of the OA letter: Claims 1-10 are rejected under Patent Law Article 22(3) as being unpatentable over reference 1 (CN104297768A), 2 (CN101198160A) and 3 (CN104749591A). |
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TWI642961B (en) | 2018-12-01 |
TW201935038A (en) | 2019-09-01 |
US20190250281A1 (en) | 2019-08-15 |
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